Ignition-dynamo.



G. T. MASON.

IGNITION DYNAMO.

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CHABLEE; THOMAS MASON, OF SUMTER, SOUTH CAROLINA, ASSIG-NGR: T SUMTEB' ELECTRICAL 'CGMFAN Y, A GORPORATIQN GE SOUTH SAEOLZNA. I

IGNI'E I-ON-DYNAMIQ.

inseed T all whom 2% may 001mm.-

Be it known that l, CHARLES THOMAS MAsoN, a citizen of the United States, residing at Sumter, in. the county of Sumter and State of South Carolina, have invented certain new and useful improvements in Ignition-Dynamos, of which the following is a specification, reference being bad to the acconuiianying drawing.

My invention relates to ignitiondynamos and particularly to those of the magneto type, and consists olt'improvements in the construction of the mining element of machines embodying the principle disclosed in a my Letters Patent for ignition dynamos,

patented Dec. 16, 1913, No. 1,081,750.

The objects of my invention are; to pro vide a machine in which end friction of the rotating element is reduced to a minimum; to combine with said friction reducing means, means for providing an efficient path for the magnetic flux between the magnet and the rotating element, whereby the loss due to the usual air is eliminated; to provide means whereby the magnetic stick or pull endwise on the rotor is prevented from affecting the'movemcnt of said rotor; and to provide a machine of increased electrical etlieiency, easily assembled, of few parts, and simple constru'ction.

Figure l a sectional longitudinal View of a magneto showing my invention, Fig. 2 a sectional view on an enlarged scale of the I left-hand ball bearings shown in Fig. 1, and Fig. 3, view of the inside surface of one end plate. The same figures or" reference denotethe same parts wherever they are shown.

Lotes a permanent magnet in which .ioned the end plates 2 and 3 of the armature structure. in these plates are bearings for the shafts oi. the rotating ele ment or rotor form d of the magnetic pieces "l and 5 ,ioincd together by the non-magnetic block 6.

The end plates 2 and 3 carry the non-mag- I Q 1e permanent niag- 7 Specification of Letters men. I Pmi md m 39 19 5 Application filed July 28, 1913. Serial 120i 781,398.

which the peak of the generated E. M. F.

will be produced, the pole pieces of the core 9 are turned about the axis of the rotor by turning the entire structure consisting of the core 9, the rings '7 and 8 and the end plates 2 and 3, the latter of course having hearings in the magnet poles for their QXtBIb.

sion sleeves or collars, through which the shaft ends of the rotor elements pass.

It is evident that the rotating elements 4: and 5 arepernianently of the same p0-=" larity as the respective magnet poles adja cent to them, but may have a tendency to stick against the end plate 2 or 3 interposed between them and the magnetl, thus making the machine inclined to hard or jerky action, unless the parts are made a comparatively loose fit, which is objectionable because of loss of efii'ciency. To eliminate th1s, I place in each end plate a row of balls as indicated at 10 and 11, so-that the lateral surfaces of the rotating element and the adjacent end plate are not in direct frictional contact over a large surface. This eliminates the sticking referred to,"and also serves to eliminate much of the usual mechanical-friction present if the adjacent lateral surfaces touch each other.

It is obvious that a certain amount of.

lubrication is necessary between the surface of the rotating elements and the end plates against which they bear, and the introduction of any lubricant necessarily forms a gap ,or separation in the magnetic circuit. It is also obvious that this magnetic circuit should be perfect as possible between the rotating element and the magnet pole, and

it the balls referred to are made from steel, which is the usual practice, they form a good path for the magnetic flux, thereby eliminating the weakening effect which 00-, I

curs when the balls are not used. By the above construction 1 am enabled to obtain a freely movable rotor, and yet obtain the highest efficiency, all actual air gaps and loose fits between the rotor and its mag net 'bei 11g eliminated.

In certain types of dynamos it is necessary-to have the armature structure movable. A machine of this type. is'described in my co pending application No. 696,487, filed lliaylhth, 1912. "When this is the case, to preserve the continuity of the magnetic cir cuit, balls may be placed on both sides of the end plates as shown in Figs. 1 and 2, 12

' structure is freely movable within the mag-- indicating the additional or outside set of ballsv which are placed between the inner surface of the magnet 1, and the end plates 2 or 3. The ,insideset of balls indicated at 10, is placed between 3 and the rotor 4:, as previously described. J By this means not only is friction reduced in the rotor as hereinbefore described, but the entire armature net without introducing any air gaps in the magnetic circuit. I

Although ball bearings may be used, it will be observed that the balls are not used as bearings, as they do notsupport or carry' the various parts. While in a measure they do obviate end thrust, this thrust is due to magnetism--and is not end thrust in the mechanical sense in which the term is usually used. I therefore consider by employment of balls, as shown, to be new in connection with ignition magnetos of this type, and it is obvious that the arran ement and location of the balls for accomp ishing this result may be varied without departing from my invention. I also deem the method of using balls of magnetic material for forming a path for the magnetic flux between the various parts of this type ofmachine, to be new. It is obvious however that other forms than spheressuch as small rollerscould be used.

Having thus described my invention, what I claim and desire to secure by Letters Pat ent is y 1. In a dynamo, a magnet, end plates adjacent the polar extremities of said magnet,

not, end plates movable about the axis of the,

rotor, which is also their own axis, said end plates interposed between the ends of the rotor and the opposed cheeks of the magnet poles, and friction reducing magnetically conducting bearing means between said end plates and the said cheeks of the magnet voles, together with an armature coil supported from said end plates.

In testimony whereof I hereunto"afiix my signature in the presence of two Witnesses.

' CHARLES THOMAS MASON.

Witnesses:

F. C. MANNING, H. B. VAN DEVENTER. 

